perf env: Add perf_env__cpuid, perf_env__{nr_}pmu_mappings

To be used by IBS raw data display: It needs the recorder's cpuid in
order to determine which errata workarounds to apply to the data, and
the pmu_mappings are needed in order to figure out which PMU sample
type is IBS Fetch vs. IBS Op.

When not available from perf.data, we assume local operation, and
retrieve cpuid and pmu mappings directly from the running system.

Signed-off-by: Kim Phillips <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Joao Martins <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https //lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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